I dislike riding in the rain, mostly for the potential of increased flats and stopping/braking issues when it's wet. Plus, one of the worst riding experiences I've had is when I started a ride and it was maybe in the sixties and it started raining. I had a jacket with me, but not a rain jacket; I had to ride about 7 miles back to the car, where I proceeded to strip out of my wet clothes and wrap myself in a beach towel that I had in the car. Pretty sure I had hypothermia, as I didn't stop shivering for a couple of hours, even after sitting by a fire and drinking copious cups of tea.
If it's raining, it's a yoga or run day. I don't mind running in the rain.